Accioly, A.2014-05-202014-05-202003-06-15Physical Review D. College Pk: American Physical Soc, v. 67, n. 12, 4 p., 2003.0556-2821http://hdl.handle.net/11449/23521The addition of a topological Chern-Simons term to three-dimensional higher-derivative gravity is not a good therapy to cure the nonunitarity of the aforementioned theory. Moreover, R+R-2 gravity in (2+1)D, which is unitary at the tree level, becomes tree-level nonunitary when it is augmented by the abovementioned topological term. Therefore, unlike what is claimed in the literature, topological higher-derivative gravity in (2+1)D is not tree-level unitary and neither is topological three-dimensional R+R-2 gravity.4engArtigo10.1103/PhysRevD.67.127502WOS:000184075300092Acesso restritoWOS000184075300092.pdf